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  Subjects -> CHEMISTRY (Total: 843 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (594 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (42 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (67 journals)

ANALYTICAL CHEMISTRY (47 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 85)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 20)
American Journal of Analytical Chemistry     Open Access   (Followers: 29)
Analytica Chimica Acta     Hybrid Journal   (Followers: 33)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 28)
Analytical Chemistry     Full-text available via subscription   (Followers: 171)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access  
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 3)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 24)
Current Analytical Chemistry     Hybrid Journal   (Followers: 6)
Drug Testing and Analysis     Hybrid Journal   (Followers: 7)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 20)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 4)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 6)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 5)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 15)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 4)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 22)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 7)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 22)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 1)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
World Journal of Analytical Chemistry     Open Access  
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [15 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2279 journals]
  • Simultaneous separation-preconcentration and determination of trace
           amounts of mercury and cadmium in fruits, vegetables and biological
           samples
    • Abstract: Abstract A method for the simultaneous preconcentration and determination of Hg(II) and Cd(II) at the ng/mL level was studied. This method is based on solid phase extraction using 2-nitroso-1-naphthol-4-sulfonic acid modified natural clinoptilolite zeolite that is selective for mercury and cadmium. The adsorbed complexes could be eluted using dimethylformamid and the concentration of mercury and cadmium were determined by derivative spectrophotometry at appropriate (dA/dλ)s in order to work on the basis of H-point standard addition method. In optimum conditions, detection limit in the original solution is obtained 0.1 ng/mL for mercury and 0.8 ng/mL for cadmium. The preconcentration factor attainable for quantitative recovery (>95%) of Hg(II) and Cd(II) were 95 and 105 for a 1000 mL sample volume, respectively. Five times replicating determination a mixture of mercury and cadmium in 5.0 mL final solution gave a relative standard deviation of 7.8% for Hg(II) and 6.5% for Cd(II). The proposed method is applied to determine mercury and cadmium ions in plant and biological samples successfully.
      PubDate: 2016-01-01
       
  • Simultaneous determination of vitamins B 2 , B 6 and C using silver-doped
           poly(L-arginine)-modified glassy carbon electrode
    • Abstract: Abstract The silver doped poly(L-arginine)-modified glassy carbon electrode was prepared by electropolymerization. Cyclic voltammetry and electrochemical impedance spectroscopy were used to study the electrochemical properties of the modified electrode. The modified electrode exhibits good electrocatalytic activity for the oxidation of vitamin B2 (VB 2), vitamin C (VC) and vitamin B6 (VB 6). Under optimal conditions, VB2, VC and VB6 are oxidized at–0.298, 0.317 and 1.058 V, respectively, at the modified electrode using linear sweep voltammetry method. The linear ranges for VB2, VC and VB6 are 1.0 × 10–7–2.3 × 10–5, 5.0 × 10–6–4.0 × 10–3 and 1.0 × 10–5–3.0 × 10–3 M, respectively, and the detection limits are 8 × 10–8, 3 × 10–6 and 5 × 10–6 M. The modified electrode has been successfully applied to simultaneous determination VB2, VC and VB6 in multivitamin tablets with satisfactory results.
      PubDate: 2016-01-01
       
  • High-performance liquid chromatography–time-of-flight mass
           spectrometry in the identification and determination of 111 pesticides in
           food, feed, water, and soil
    • Abstract: Abstract A method has been proposed for the simultaneous identification and determination of 111 pesticides from various classes in food by high-performance liquid chromatography–high-resolution time-offlight mass spectrometry combined with simple and fast sample preparation. Possibility of the identification and determination of pesticides in drinking, natural, and ground waters without sample preparation has been demonstrated. A scheme of the identification and determination of the detected analytes using the standard addition method has been suggested. The limit of detection is 0.05 (0.1) µg/(L)kg. The relative standard deviation of the results of analysis does not exceed 0.1. The time of identification is 30–40 min and time of determination is 1–2 h.
      PubDate: 2016-01-01
       
  • Evaluation of 1,10-phenanthroline-5,6-dione as redox mediator for glucose
           oxidase
    • Abstract: Abstract A low-cost and simply fabricated amperometric glucose biosensor based on glucose oxidase (GOx) and 1,10-phenanthroline-5,6-dione (PD) modified graphite rod electrode was developed. The electrode exhibited good electrocatalytic activity with a well-defined hyperbolic dependence of amperometric signal upon glucose concentration in the presence and in the absence of oxygen. The electrode showed a good reproducibility and repeatability with relative standard deviation of less than 3 and 5%, respectively. The interaction of GOx with PD mediator was confirmed by means of UV?Vis absorbance spectroscopy.
      PubDate: 2016-01-01
       
  • Possibilities of atomic spectroscopy in the analysis of gold- and
           silver-based nanoparticles in synthesized sols and biological samples
    • Abstract: Abstract Possibilities of the determination of Au, Ag, and Si in dispersions of nanoparticles and biological samples by inductively coupled plasma atomic absorption and atomic emission spectrometry are demonstrated. Conditions of complete sample mineralization and the quantitative transfer of gold and silver to solution are found. The parameters of analyte determination in flame, graphite furnace, and plasma are optimized. The completeness of the atomization of gold, silver, and silicon in plasma on the introduction of nanoparticles as colloidal solutions is estimated. The conducted research allowed the estimation of the degree of gold and silver reduction at different stages of synthesis of composite nanoparticles with the core/shell structure. Quantitative information on the dynamics of accumulation and the redistribution of composite nanoparticles with gold or silver shells in organs and tissues of mices after the intravenous administration of colloidal solutions of nanoparticles.
      PubDate: 2016-01-01
       
  • X-ray fluorescence analytical signal of elements with small atomic numbers
           as a function of the energy of primary photons
    • Abstract: Abstract The dependence of the intensity of X-ray fluorescence on the energy of photons exciting X-ray radiation is considered. For elements with small atomic numbers, the direct ionization of atoms, the major process for the majority of elements of the Periodic Table, is the main only at low energies of primary photons. With the growth of photon energy, the intensity of fluorescence due to photo and Auger electrons arising in the irradiated material increases. This component at certain energy becomes predominant. The further increase in the energy of primary photons leads to the suppression of the ionization of atoms by recoil electron arising in the incoherent (Compton) scattering of primary radiation. The effects of the energy of primary photons on the intensity of X-ray fluorescence for the studied processes differ significantly. The depth of these effects determines their contributions to the formation of the analytical signal. Study of the influence of excitation conditions allows the analyst to intelligently solve problems of the optimization of the X-ray fluorescence determination of elements with small atomic numbers.
      PubDate: 2016-01-01
       
  • Application of magnetic treatment to changing the composition and
           physicochemical properties of crude oil and petroleum products
    • Abstract: Abstract The effect of magnetic field on the composition and physicochemical properties of oil and petroleum products is described. Experimental data are presented, illustrating that the structure of heavy oil residues (HORs) of different origin can be changed upon exposure to a magnetic field. The effect of exposure time and power of magnetic field on changes in the composition of HOR solutions in various solvents (toluene, n-hexane, dichloromethane, and isopentane) is studied. The use of magnetic field at the stage of sample preparation of solutions is proposed in the identification of heavy oil residues and the elucidation of their origin based on gas chromatography with a mass-selective detector (GC–MS).
      PubDate: 2016-01-01
       
  • Determination of residual amounts of Rosuvastatin Calcium on the surfaces
           of pharmaceutical equipment by HPLC and luminescence
    • Abstract: Abstract Highly sensitive procedures are proposed for the chromatographic (high-performance liquid chromatography, HPLC) and luminescence determination of trace amounts of Rosuvastatin Calcium in washings after the cleanup of pharmaceutical equipment. The developed procedures are validated for the following parameters: specificity, linearity, accuracy, detection limit, and quantification limit. The calibration curves are presented in the concentration range 0.01–1.0 µg/mL (HPLC) and 0.1–10.0 µg/mL (luminescence); the detection limits are 0.005 and 0.032 µg/mL, respectively. The efficiency of the sampling method is over 90%. It is found that the difference in the results of analysis of samples by two procedures is statistically insignificant. The luminescence procedure compared to HPLC has several advantages, i.e., lesser labor intensity, rapidity, and lesser reagent consumption; but the HPLC procedure is an order of magnitude more sensitive.
      PubDate: 2016-01-01
       
  • Quantitative estimation of brominated compounds for restriction of
           hazardous substances (RoHS) present in computer key board switches (CKBS)
           using gas chromatography-mass spectrometry
    • Abstract: Abstract A reliable, cost effective and user-friendly method has been used for the determination of polybrominated diphenylethers (PBDE) in computer key board switches (CKBS). The presence of the commercially added BDE-209 which is decabromo diphenyl ether (Deca-BDE) congener has been identified, established and estimated using gas chromatography–mass spectrometry. For extracting the analyte quantitatively from the material, Soxhlet extraction using toluene followed by multi-layer silica column chromatography was used to obtain the desired unambiguous quantitative results as per standard method. The results were confirmed by repeating, reproducing using standard addition recovery and by calculating measurement uncertainty. The CKBS samples contain around 49.6 ± 0.5 mg/kg of BDE-209. The recovery of spiked standard was between 90–93% and the linearity of the standard curve had a correlation coefficient of R 2 = 0.9974.
      PubDate: 2016-01-01
       
  • An arginine selective colorimetric assay using azobenzothiazole-polyene
           based dipolar molecular receptor
    • Abstract: Abstract A new simple colorimetric method for selective determination of arginine was developed using an azobenzothiazole-polyene dye. The benzothiazole moieties of the dye act as dipolar molecular receptors to arginine. Importantly, arginine could be recognized in solution with the naked eye due to the color change from orange to blue. Reproducibility of the assays was proven by calculating of the intraand inter-assay variations for the color responses and the variations were found to be 6.9 and 4.2%, respectively. Finally, the accurate measurements of arginine in real samples (commercial supplementary medicines) were achieved. In conclusion, validation of the developed method revealed excellent performance characteristics, including long life span, good arginine selectivity among a wide variety of other amino acids and long-term response stability.
      PubDate: 2016-01-01
       
  • Identification and determination of antibacterial substances in drugs by
           capillary electrophoresis
    • Abstract: Abstract Methods of the quality control of finished dosage forms by capillary zone electrophoresis and micellar electrokinetic chromatography have been proposed. The optimum conditions for the separation and determination of different classes of antibacterial substances, penicillins, fluoroquinolones, nitrofurans, sulfanilamides, metronidazole, and chloramphenicol have been selected. The analytical range for the active ingredients of drugs was 1–1000 mg/g for solid and 0.001–0.50% for liquid drugs. The relative standard deviation of the results of analysis did not exceed 4%.
      PubDate: 2016-01-01
       
  • Determination of manganese(II) in wines by stripping voltammetry on solid
           electrodes
    • Abstract: Abstract We developed a procedure for determining manganese(II) in wines by stripping voltammetry on a graphite electrode as a poorly soluble compound. The detection limit of manganese(II) is 50 µg/L. The dependence of the analytical signal of manganese(II) on its concentration in solution is linear in the range 0.1–3 mg/L. It is demonstrated that the results of the stripping voltammetric determination of manganese(II) in wines agree with the data obtained by inductively coupled plasma mass spectrometry and EPR spectrometry.
      PubDate: 2016-01-01
       
  • Application of the curve resolution method to the preprocessing spectral
           data in two-layer systems
    • Abstract: Abstract An approach is proposed for recovering individual spectra of components in two-layer systems using the method of multivariate curve resolution–alternating least squares. The method is applicable to recording spectra in the near infrared region in both transmission and diffuse reflectance modes. The efficiency of the method is tested on a model system polymer film–polymer film and on real samples polymer packaging film–infinite layer of powdered product.
      PubDate: 2016-01-01
       
  • Use of functionalized nanoporous silica for the microextraction by packed
           sorbent of ellagic acid from fruit juice
    • Abstract: Abstract A semi-automated microextraction by packed sorbent (MEPS) method was developed for the HPLC determination of ellagic acid (EA) in juice samples. The procedure includes enrichment of the analyte on a nanoporous silica sorbent by the MEPS method using a laboratory-made programmable apparatus. Three functionalized SBA-15 nanoporous sorbents were evaluated for this purpose and 3-[bis(2-hydroxyethyl)amino]propyl-triethoxysilane (HPTES)-SBA-15 showed superior efficiency. Only 2 mg of the adsorbent packed in a syringe’s hub was sufficient for a quantitative recovery of EA. Different factors influencing the performance of the MEPS method such as the nature of desorption solvent, elution volume, pH, number of extraction cycles (draw–eject) and sample volume were carefully studied and optimized. Under the optimized conditions, a detection limit of 0.8 mg/L and a linear calibration curve with an R 2 of 0.9995 were obtained for EA. The average recovery of the analyte for juice samples was 97.6% with a relative standard deviation of 4.4% for six replicates. The method was successfully applied to the HPLC determination of EA in pomegranate and grape juice samples.
      PubDate: 2016-01-01
       
  • Narcotic substances of natural origin and methods of their determination
    • Abstract: Abstract The main representatives of narcotic substances of natural origin are considered. Methodological solutions used in their screening, identification, and quantitative determination in raw materials, dosage forms, and biological materials are discussed. Prospects of application of state-of-the art hybrid methods combining chromatographic separation with mass spectrometric determination are noted.
      PubDate: 2016-01-01
       
  • Applicability of the critical chromatography concept to proteomics
           problems: I. Effect of the stationary phase and the size of the
           chromatographic column on the dependence of the retention time of peptides
           and proteins on the amino acid sequence
    • Abstract: Abstract A theoretical study of the effect of stationary phase parameters on the regularities of the separation of peptides and proteins using a model of critical chromatography BioLCCC and the Theoretical chromatography software created on its basis has been performed. The following problems have been discussed: mechanism of the migration of chromatographic peak along the column and its compression in gradient elution; dependence of the coefficient of protein separation on the column length; inversion of the elution order of peptides at a change of the diameter or length of the column, adsorbent nature, conditions of emergence of inversion; and anomaly of the dependence of the retention time of proteins on the adsorbent activity.
      PubDate: 2016-01-01
       
  • Tandem high-resolution electrospray ionization mass spectrometry of
           fluorinated thevinols and 18,19-dihydrothevinols
    • Abstract: Abstract Fragmentation of fluorinated 18,19-dihydrothevinols and thevinols under electrospray ionization with collisionally activated dissociation accompanied by the elimination of an amine fragment from the cycle and the subsequent loss of H2O and CH3OH have been studied. For thevinol derivatives with a double bond at C18=C19, the [M + H]+ ions undergo the retro-Diels–Alder fragmentation, the abundance of which depends on substituents at the nitrogen and C20 atoms. The retro-Diels–Alder fragmentation of the [M + H]+ ions of thevinols bearing–CH3,–CH2CH=CH2, and \( - C{H_2} - \triangleleft \) groups at the nitrogen atom occurs due to the formation of a protonated diene molecule, whereas the elimination of a neutral diene in thevinols with hydrogen at the nitrogen atom has been observed.
      PubDate: 2015-12-01
       
  • Simultaneous determination of the elemental composition and ash content of
           carbon materials by total reflection X-ray fluorescence
    • Abstract: Abstract Modern methods for the determination of the elemental composition and ash content of carbon materials are considered. The use of total reflection X-ray fluorescence analysis (TXRF) for the simultaneous determination of the elemental composition and ash content of carbon materials on quartz reflectors is proposed. The results of quantitative analysis are compared with the results obtained by certified procedures of inductively coupled plasma atomic emission spectrometry and gravimetry. Prospects for the use of TXRF in the analysis of samples of the metallurgical industry are discussed.
      PubDate: 2015-12-01
       
  • Complexation of titanium(IV) malonates with phenylfluorone and
           2,7-dichlorochromotropic acid on a solid phase of PANV-AV-17
    • Abstract: Abstract Complexation of titanium(IV) with 2,7-dichlorochromotropic acid and phenylfluorone is studied by diffuse reflection spectroscopy after the adsorption of titanium complexes with organic acids on a polyacrylonitrile fiber filled with an AV-17 anion exchanger. The dependence of the analytical signal on the conditions of adsorption in the dynamic mode is studied, namely, on the nature and concentration of the organic acid, pH of the initial solution, concentration of titanium, and presence of foreign ions. Based on a comparison of the analytical characteristics of complexation reactions, the following system was selected for the determination of 0.01–0.05 µg/mL of titanium in drinking water: adsorption from a 2 × 10–3 M solution of malonic acid with pH 3.5–4, reaction with phenylfluorone in the solid phase, and spectroscopic signal recording at 600 nm or visual detection using a color scale. It was shown that phenylfluorone is superior to 2,7-dichlorochromotropic acid both in sensitivity and selectivity of titanium determination after adsorption on the solid phase of PANV-AV-17 as titanium malonate complexes.
      PubDate: 2015-12-01
       
  • A colorimetric sensor based on a polymethacrylate matrix with immobilized
           1-(2-pyridylazo)-2-naphthol for the determination of cobalt
    • Abstract: Abstract A colorimetric sensor is proposed for the determination of cobalt. It is prepared by immobilizing 1-(2-pyridylazo)-2-naphthol (PAN) in an optically transparent polymethacrylate matrix. The conditions for determining cobalt by the proposed colorimetric sensor are found in the study of the complexation of cobalt with a PAN-modified polymethacrylate matrix. The determination is based on the interaction of the sensor with a cobalt solution at pH 4 for 5 min, followed by the measurement of absorbance at 620 nm. The sensor ensures the determination of 0.05–0.50 mg/L of cobalt with the detection limit 0.03 mg/L. It is demonstrated that the sensor can be used for the determination of cobalt in the Cyanocobalamin medical preparation and potable water.
      PubDate: 2015-12-01
       
 
 
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